Hibernate多对多经典实例.docx

hibernate.cfg.xml： truetrueoracle.jdbc.driver.OracleDriverjdbc:oracle:thin:3:1521:tarena10gopenlabopen1232noneorg.hibernate.dialect.Oracle9DialectCourse.javaimport java.util.HashSet;import java.util.Set;public class Course private Long oid;private String cid;private String name;/ 关联属性(m:n)private Set stus = new HashSet();public Course() super();public Course(String cid, String name) super();this.cid = cid; = name;public String getCid() return cid;public void setCid(String cid) this.cid = cid;public String getName() return name;public void setName(String name) = name;public Long getOid() return oid;public void setOid(Long oid) this.oid = oid;public Set getStus() return stus;public void setStus(Set stus) this.stus = stus;Overridepublic int hashCode() final int PRIME = 31;int result = 1;result = PRIME * result + (cid = null) ? 0 : cid.hashCode();return result;Overridepublic boolean equals(Object obj) if (this = obj)return true;if (obj = null)return false;if (getClass() != obj.getClass()return false;final Course other = (Course) obj;if (cid = null) if (other.cid != null)return false; else if (!cid.equals(other.cid)return false;return true;Course.hbm.xml Student.javaimport java.util.HashSet;import java.util.Set;public class Student private Long oid;private String sid;private String name;/ 关联属性(n:m:private Set cours = new HashSet();public Student() super();public Student(String sid, String name) super();this.sid = sid; = name;public Set getCours() return cours;public void setCours(Set cours) this.cours = cours;public String getName() return name;public void setName(String name) = name;public Long getOid() return oid;public void setOid(Long oid) this.oid = oid;public String getSid() return sid;public void setSid(String sid) this.sid = sid;Overridepublic int hashCode() final int PRIME = 31;int result = 1;result = PRIME * result + (sid = null) ? 0 : sid.hashCode();return result;Overridepublic boolean equals(Object obj) if (this = obj)return true;if (obj = null)return false;if (getClass() != obj.getClass()return false;final Student other = (Student) obj;if (sid = null) if (other.sid != null)return false; else if (!sid.equals(other.sid)return false;return true;Student.hbm.xml HbnUtil.javaimport org.hibernate.HibernateException;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;public class HbnUtil private static SessionFactory sf;static try sf = new Configuration().configure().buildSessionFactory(); catch (HibernateException e) e.printStackTrace();public static Session getSession()return sf.openSession();Test1.javaimport org.hibernate.HibernateException;import org.hibernate.Session;import .entity.Course;import .entity.Student;import com.tarena.enrollment.util.HbnUtil;public class Test1 public static void main(String args) Session s = HbnUtil.getSession();try s.beginTransaction();Student s1 = new Student(s001,Jack);Student s2 = new Student(s002,Rose);Course c1 = new Course(c001,Core java);Course c2 = new Course(c002,JDBC);s1.getCours().add(c1);s1.getCours().add(c2);c1.getStus().add(s1);c2.getStus().add(s1);s.save(s1);s.save(c1);s.save(c2);s.getTransaction().commit(); catch (HibernateException e) s.getTransaction().rollback();e.printStackTrace(); finally s.close();Test2.javaimport org.hibernate.HibernateException;import org.hibernate.Session;import .entity.Course;import com.tarena.enrollment.util.HbnUtil;public class Test2 public static void main(String args) Session s = HbnUtil.getSession();try s.beginTransaction();/Student s1 = (Student)s.get(Student.class,1L);Course c1 = (Course)s.get(Course.class, 2L);/*System.out.println(s1.getClass();System.out.println(s1.getCours().getClass();System.out.println(s1.getCours().size();*/c1.getStus() .iterator() .next() .getCours() .remove(c1);s.delete(c1);/s1.getCours().clear();/c1.getStus().clear();s.getTransaction().commit(); catch (HibernateException e) s.getTransaction().rollback();e.printStackTrace(); finally s.close();Test3.javaimport org.hibernate.HibernateException;import org.hibernate.Session;import .entity.Course;import .entity.Student;import com.tarena.enrollment.util.HbnUtil;public class Test3 public static void main(String args) Session s = HbnUtil.getSession();try s.beginTransaction();Student s1 = (S